Sowerdons a ithe 4oestiens that have boen assigned. 1. What esperimental evidence leads scientists to believe that only quantixed electronic energy ithes exist is asoms? 2. a. What is the wavelength range of the visible spectrum for electrocnagnetic radiation? b. What is the color of the short wavelength region of the visible spectrum? c. If a substance absorbed the wavelengths from the short wavelength region of the visible spectrum, what would be; its color? 3. Explain why "roses are red and violets are blue." 4. a. Is the energy absorption associated with bands in an infrared spectrum of higher or lower cnergy thum the lincs appearing in a visible line spectrum? Explain. b. Identify the type of energy transition occurring in a molecule that catases a band to appear in an infrared spectrum. c. Identify the fype of encrey trinsition occurring in an atom that causes a line to appear in a visable line spectrum. 5. Sibce FeNCS 2+ has an absorption massimum at 447nm, what is the color of the FeNCS t loa in solution? 6. a. Write the Lewis structure for XeF4. b. Write the VSEPR formula for XeF4. c. Sketch (or deseribe) the three-dimensional structure (or geometrie shape) of XeF4. d. What are the approximate FXeF bond angles in XeF4 ? 7. Glycine, the simplest of the amino acids, has the formula, CH2(NH2COOH, and the Lewis strueture at risht. a. Write the VSEPR formula for the nitrogen atom as the central atom in glycine. b. Based on VSEPR theory, what is the approximate CNH bond angle in glycine? Fxplains c. What is the approximate OCO bond angle in glycine? Explain. d. Identify at least two absorption bands (and corresponding cm1 ) that would likely appear in the infrared spectrum of glycine. 172 Atomic and Molecular Structure